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Static cyclic fatigue resistance evaluation of Neoniti rotary files at different insertion angles
Afzal Ali1, Nihat Umut Gözen2, Abdurrahman Kerim Kul2, Aasima Ishaq1, Vivek Vadera31Department of Conservative Dentistry and Endodontics, Pacific Dental College and Hospital, Rajasthan, India2Department of Endodontics, İstanbul Health Sciences University Faculty of Dentistry, İstanbul, Turkey
3Department of Conservative Dentistry and Endodontics, Darshan Dental College and Hospital, Rajasthan, India
Purpose: Different insertion angles of the rotary files during the root canal shaping may influence the cyclic fatigue resistance (CFR). The present study aimed to evaluate the effects of different insertion angles on a file’s static CFR at body temperature.
Methods: Eighty new Neoniti (Neolix, Châtres-la-Forêt, France) 25 mm long files were used. The stainless-steel metal block had four artificial canals with different insertion angles (0°, 10°, 20°, and 30°). The files were subjected to a static cyclic fatigue procedure at simulated body temperature (36 ± 1). The number of cycles to failure (NCF) and fractured instrument length were recorded. The Kruskal–Wallis H test analyzed the data at a 95% confidence interval (p = 0.05).
Results: For #20.06 and #25.06 instrument, the 10°, 20°, and 30° insertion angles resulted in decreased static fatigue resistance as compared to straight (0°) insertion angle (p< 0.05).
Conclusion: When the insertion angle increases, the static CFR decreases. An inclined insertion into the canals decreased the CFR of the endodontic instruments.
Manuscript Language: English
